Magnetization directions of individual nanoparticles

被引：211

作者：

Majetich, SA ^{[1
]}

Jin, Y ^{[1
]}

机构：

[1] Carnegie Mellon Univ, Dept Phys, Pittsburgh, PA 15213 USA

来源：

SCIENCE | 1999年 / 284卷 / 5413期

关键词：

D O I：

10.1126/science.284.5413.470

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

The magnetization directions of individual monodomain nanoparticles as small as 5 nanometers in diameter are determined using the Foucault method of Lorentz microscopy. A model is developed to explain the images and diffraction patterns of samarium cobalt nanoparticles as a function of the aperture shift direction. Thermally induced changes in the magnetization direction of superparamagnetic magnetite nanoparticles were observed but with a much stower rate than expected, due to surface anisotropy. When the time scale for magnetization reversal is much shorter than the data acquisition time, as in carbon-coated iron cobalt alloy nanoparticles, the images show an average of such thermally induced changes.

引用

页码：470 / 473

页数：4

共 31 条

[11] DOMAINS IN THIN MAGNETIC FILMS OBSERVED BY ELECTRON MICROSCOPY [J].

FULLER, HW ;

HALE, ME .

JOURNAL OF APPLIED PHYSICS, 1960, 31 (10) :1699-1705

[12] OBSERVATION OF THE SWITCHING FIELDS OF INDIVIDUAL PERMALLOY PARTICLES IN NANOLITHOGRAPHIC ARRAYS VIA MAGNETIC FORCE MICROSCOPY [J].

GIBSON, GA ;

SMYTH, JF ;

SCHULTZ, S ;

KERN, DP .

IEEE TRANSACTIONS ON MAGNETICS, 1991, 27 (06) :5187-5189

[13] LORENTZ MICROSCOPY OF GIANT MAGNETORESISTIVE AU-CO ALLOYS [J].

HUTTEN, A ;

BERNARDI, J ;

NELSON, C ;

THOMAS, G .

PHYSICA STATUS SOLIDI A-APPLIED RESEARCH, 1995, 150 (01) :171-184

[14]

JACKSON JD, 1975, CLASSICAL ELECTRODYN, P178

[15] GROWTH OF HIGH-ASPECT-RATIO NANOMETER-SCALE MAGNETS WITH CHEMICAL-VAPOR-DEPOSITION AND SCANNING-TUNNELING-MICROSCOPY [J].

KENT, AD ;

SHAW, TM ;

VONMOLNAR, S ;

AWSCHALOM, DD .

SCIENCE, 1993, 262 (5137) :1249-1252

[16]

KNELLER E, 1969, MAGNETISM METALLURGY, P385

[17] PARTICLE SIZE DEPENDENCE OF COERCIVITY AND REMANENCE OF SINGLE-DOMAIN PARTICLES [J].

KNELLER, EF ;

LUBORSKY, FE .

JOURNAL OF APPLIED PHYSICS, 1963, 34 (03) :656-&

[18] Surface spin disorder in NiFe2O4 nanoparticles [J].

Kodama, RH ;

Berkowitz, AE ;

McNiff, EJ ;

Foner, S .

PHYSICAL REVIEW LETTERS, 1996, 77 (02) :394-397

[19]

LEDERMAN M, 1993, J APPL PHYS, V73, P6951

[20] Magnetization reversal in SmCo5 nanoparticles [J].

Majetich, SA ;

Kirkpatrick, EM .

IEEE TRANSACTIONS ON MAGNETICS, 1997, 33 (05) :3721-3723

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